The plasma membrane needs lipids, which make a semi-permeable barrier between the cell and its environment. It also needs proteins, which are involved in cross-membrane transport and cell communication, and carbohydrates, which decorate both the proteins and lipids and help cells recognize each other. Hope this helps :)
<span>Carbon-based macromolecules are found in all life forms.</span>
Lack of antibodies because thats the stuff to fight things away
The answer to this is the last option i think
<span>sperm and egg cells uniting to produce fertilized eggs</span>
